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a relatively common but not much studied shark in the genus Squatina, the only genus in the family Squatinidae. This is the sole family in the order Squatiniformes, which contains all of the angel sharks. The scientific name of the sand devil shark is Squatina dumeril. It is also commonly called the Atlantic angel shark.

Like all of the angel sharks, the sand devil shark has a body shape that resembles a bat: compressed from the top and flattened out on its undersurface. The large pectoral and pelvic fins are splayed out to each side, resembling wings. The top and bottom fins of the sand devil shark also resemble those of other angel sharks. The two dorsal, or top, fins measure approximately the same size but lack a frontal spine. There is no anal, or unpaired bottom, fin.

The body coloration of the sand devil shark is grayish to yellowish brown above and white below. The head is large and round, with the eyes and nostrils in the front of the low-domed top. The nostrils have barbels, which are sensory organs, hanging in front of them. These barbels gradually narrow down to smooth or slightly fringed bottom edges. There are fairly large spines on the snout, above the eyes, and on the midline of the back and the tail.

Both the upper and lower teeth are relatively small but extremely sharp. The sand devil shark also has dermal denticles, teethlike structures that run along the sides of its body. These denticles are slightly hooked and shaped like thorns, with three ridges running up and down their length.

Sand devil sharks can grow to a maximum size of about 4.9 feet (1.5 meters) long. They give birth to living, fully formed young. The diet includes small bottom-dwelling fishes, crustaceans and bivalves. Like other angel sharks, the sand devil shark thrusts its jaw forward, grabbing with its sharp teeth, and pulling prey back into its mouth in a quick and effective snatching movement. They are not known ever to have attacked people without provocation.

The range of the sand devil shark includes the western North Atlantic Ocean off the coast of New England in the United States, and south to the Gulf of Mexico and off Jamaica and Venezuela. Their flattened body shape is well adapted for resting on bottom, and it is presumed that they spend most of their time there, covered with sand or mud while waiting for prey to grab. These sharks inhabit depths ranging from very shallow areas(particularly in spring and summer) near the surf line, to as deep as 4,560 feet (1,390 meters). The sand devil shark is not fished commercially.

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